EP2370230A1

EP2370230A1 - Machining center

Info

Publication number: EP2370230A1
Application number: EP10701825A
Authority: EP
Inventors: Jürgen Hempelmann
Original assignee: Hedelius Maschinenfabrik GmbH
Current assignee: Hedelius Maschinenfabrik GmbH
Priority date: 2009-02-06
Filing date: 2010-01-28
Publication date: 2011-10-05
Anticipated expiration: 2030-01-28
Also published as: EP2370230B1; ES2430062T3; SI2370230T1; DK2370230T3; WO2010089051A1; DE202009002504U1; PL2370230T3

Abstract

The invention relates to a machining center having a machine base (1), the horizontal longitudinal alignment thereof defining an X-axis (X-direction), the horizontal transverse alignment thereof defining a Y-axis (Y-direction, and the vertical alignment thereof defining a Z-axis (Z-direction), having a protective enclosure (2) attached to the machine base (1) having at least one loading opening (3) on a long side, a working space being formed within the protective enclosure (2), a workpiece positioning area (7) extending in the X-direction being disposed near the loading opening (3), and a traversing guide (8) extending parallel to the workpiece positioning area (7) being disposed behind the workpiece position area (7) as seen from the loading opening (3), a traversing stand (9) having at least one machining head (10) traversing on the traversing guide (8) in the X-direction, at least one workpiece clamping device in the form of a rotating/pivoting table unit (14) being disposed in the workpiece positioning area (7), the pivot axis thereof being aligned in the X-direction, and machining a workpiece clamped in the workpiece positioning area (7) being possible by means of the machining head (10) of the traversing stand (9) having a tool loaded therein. The invention is characterized in that the rotating/pivoting table unit (14) comprises a pivot joint (16) supporting the rotary table (15) only on one side.

Description

machining center

The invention relates to a machining center having the features of the preamble of claim 1.

Machining centers of the type in question are used in machine and plant construction of complex workpieces on five or six surfaces by means of three-axis or five-axis machining. Both a three-axis and a five-axis machining serve a traveling column with at least one machining head. The traveling column is usually constructed in the manner of an X-Y-Z carriage. It can be completed with various additional processing heads. For example, an angle milling head on the traveling column can be used for horizontal machining of the workpiece clamped tightly by means of a workpiece clamping device.

It is expedient if the traveling column has at least one moving tool magazine. This should be expediently be equipped from the back of the machining center. In detail, this prior art is known (DE-U-20 2006 009 653).

From a three-axis machining one reaches a five-axis machining of the workpiece when the Werkstückaufspannvoπichtung is equipped with a rotary swivel unit. In this case, there is a swiveling bridge pivotally mounted about a horizontal axis on the machine base in the working space inside the protective covering. On this swivel bridge is in turn a 360 °, at least 180 ° rotatable turntable on which the workpiece can be clamped. Thus, the workpiece can be completely rotated about its vertical axis and, as a rule, swivel in the room by +/- 90 °. Together with the Dreiachsenfuhrung of the machining head on the traveling column results in the total five-axis machining possibility for the workpiece.

If a work piece is to be machined on all six sides, it must first be machined on the sixth side, for example a foot plate of the work piece, - -

completely edit. This regularly serves a fixed table unit, which is often located immediately adjacent to the rotary-swivel unit in the working space of the machining center. In the prior art from which the invention is based (DE-U-20 2006 009 653), this fixed table unit is located in the Y direction next to the rotary swivel table unit.

If the workpiece is completely machined on the sixth side, it is re-clamped onto the clamping surface of the rotary swivel table unit. The sixth side of the workpiece is now its bottom and is no longer machined. The other five pages can be edited with the five-axis unit. The already finished bottom of the workpiece serves as a reference plane for the laser-guided guidance of the machining head for the following processing of the workpiece on the other sides.

In the known machining center, the rotary-swivel unit is carried out like a trough with two supporting pivot joints, between which the turntable is lowered on the pivot bridge. This arrangement of the rotary swivel table unit with its pivot axis in the X direction has the great advantage that the machining head can freely approach the workpiece clamped on the five-axis unit in the Y direction.

A disadvantage of the known construction that the machining head in the X direction has a limited radius of action and that a clamped on the fixed table unit workpiece must be lifted over the voluminous supporting pivot between Festtischeinheit and rotary-swivel unit over when clamping on the rotary swivel unit.

The teaching is therefore based on the problem of further optimizing the known machining center with regard to the machining of workpieces.

The above-mentioned problem is solved in a machining center having the features of the preamble of claim 1 by the features of the characterizing part of claim 1. Advantageous embodiments and further developments are the subject of the dependent claims. According to the rotary swivel table unit is mounted only on one side in a supporting pivot joint. Thus, the other, in the X direction opposite side of the rotary-swivel unit is free, the turntable is accessible from there down to its clamping surface. The operating radius of the machining head of the traveling column is not restricted from here even in the X direction. A workpiece can be moved more or less freely between the fixed table unit and rotary-swivel unit back and forth. For this purpose, it is preferably provided that the clamping surface of the turntable of the rotary swivel unit in the horizontal position and the clamping surface of the fixed table unit lie substantially in one plane.

For even greater stability of the rotary-swivel-table unit while optimizing the accessibility of the workpiece, it may be advisable for the rotary-swivel-table unit to be pivotably supported relative to the load-bearing swivel joint in a small support bearing. The small support bearing serves only for additional support on the side of the turntable facing away from the actually supporting pivot joint. Only with particularly high forces on the turntable is this small additional support bearing in function. It hardly contributes here, especially not when the support bearing in the Z direction does not or only slightly protrudes beyond the clamping surface of the fixed table unit.

In the following the invention will be explained in more detail with reference to a drawing showing only a preferred embodiment. In the drawing shows

Fig. 1 shows a machining center according to the invention with opened

Protective door in a Y-direction view from the loading opening,

Fig. 2 shows the machining center of Fig. 1 in a sectional view from the left in Fig. 1 and

Fig. 3 shows the machining center of Fig. 1 in a plan view, the traveling stand partially cut away. - -

The invention relates to a machining center as it has long been known from practice. This first comprises a machine base 1, on which a circumferential protective cover 2 is attached. The machine base support 1 defines with its horizontal longitudinal orientation an X-axis or X-direction, with its horizontal transverse orientation a Y-axis or Y-direction and with its vertical orientation a Z-axis or Z-direction. This is referred to again and again in the following.

In the illustrated embodiment, the protective cover 2 is circumferential, upwards, however, open. This corresponds to the usual equipment of corresponding machining centers. The waste heat of the machining center can thus easily escape upwards. But there are also machining centers in which the protective cover 2 is closed at the top. In particular, these are machining centers with air conditioning. The protective cover 2 serves to keep the environment of the machining center clean.

In order to be able to introduce workpieces into the machining center and remove them therefrom, the circumferential protective covering 2 has a wide loading opening 3 on one longitudinal side of the machine base support 1. The loading opening 3 is supported by a protective cover 2 and / or the machine base support 1 Protective door 4 closed. In Fig. 1 it can be seen the protective door 4 moved away from the Beschickungsöffhung 3 to the right, the Beschickungsöffhung 3 is thus open.

As already explained in the prior art, from which the invention proceeds, the protective door 4 can be opened and closed manually. But also motor drives are known. The protective door 4 regularly has a large observation window 5. The protective door 4 can also be realized in the form of two preferably counter-rotating part-protective doors.

Within the protective cover 2 is a large work space. This can still be accessed separately by additional doors 6 at different locations, but this is not important in the present case. It is essential that in the working space near the feed opening 3, a workpiece positioning area 7 extending in the longitudinal direction of the work space and, viewed from the feed opening 3, behind the workpiece positioning area 7 a is provided parallel to the Werkstückpositionierbereich 7 ersteckende Verfahrführung 8. The Werkstückpositionierbereich 7 is therefore logically close to the Beschickungsöffhung 3, in Fig. 1 so arranged in front, behind it is the Verfahrführung 8, which is only indicated in Fig. 3.

The movement guide 8 is used to move a traveling column 9, which can be moved substantially over the full length of the working space within the protective covering 2. This carries at least one machining head 10, with which then by means of a corresponding machining tool, the machining of a workpiece can be done. Workpieces are not shown in the drawing.

In Figs. 1 to 3 can be seen, moreover, still a conventional CNC control panel 13 for the machining center. Moreover, it is recommended that the traveling column 9 has a moving tool magazine, so that the necessary tools for the machining head 10 are always available in the field. The CNC control console 13 is here arranged suspended on a pivotable arm and pivoted in Fig. 2 by 180 ° with respect to Fig. 1 and Fig. 3 shown.

Incidentally, in FIG. 2, the machining head 10 in the workpiece positioning region 7 is seen in thick lines and lowered down to the workpiece clamping device in thin lines.

The processing head 10 itself is initially movable in the X direction with the traveling column 9. For its part, it can be moved relative to the traveling column 9, at least in the Y direction and in the Z direction. At least because, moreover, it may also be tiltable, tiltable and / or rotatable, depending on the requirements of the funicular machining unit.

1 to 3 show in connection that in the workpiece positioning region 7, first, a workpiece clamping device in the form of a rotary swivel table unit 14 is arranged. The rotary-swivel unit 14 can be seen in Fig. 1 and 3 in the right part of the Werkstückpositionierbereichs 7. In Fig. 2, the section is placed so that one looks straight at this rotary-swivel unit 14.

The rotary-swivel unit 14 is aligned in this construction with its pivot axis in the X direction. The peculiarity of erfϊndungsgemäßen - -

Construction is now that, despite the orientation in its pivot axis in the X direction, the rotary tilting table unit 14 only on one side a rotary table 15 bearing pivot joint 16 has. In Fig. 2 can be seen on this pivot joint 16, which is executed massive and large construction. It must be able to absorb high forces. In addition, this pivot joint 16 includes the pivot drive of the rotary-swivel unit 14th

The turntable 15, which is supported by the swivel joint 16, comprises a supporting swivel bridge.

Fig. 1 shows that in the manner shown a clamped on the turntable 15 of the rotary table unit 14 workpiece can be processed in the X direction from the left practically down to the clamping surface of the turntable 15. The free accessibility of the turntable 15 from the left in the X direction also shows Fig. 3 very well.

Fig. 1 and 3 show in connection further, that seen in the material positioning region 7 in the Y direction next to the rotary-swivel unit 14, a workpiece clamping device in the form of a fixed table unit 17 is arranged. It is provided here that the fixed table unit 17 has on its clamping surface in the X direction extending grooves 18 in which clamping devices for a workpiece are arbitrarily displaced.

The fixed table unit 17 allows the already discussed above pre-machining of the sixth side of a workpiece, which is then on the five-axis rotary swivel unit 14 for located on the clamping surface, hidden side.

Fig. 1 shows that it is provided here and according to the preferred teaching that the clamping surface of the turntable 15 of the rotary pivot unit 14 in a horizontal position and the clamping surface of the fixed table unit 17 lie substantially in one plane. Such a position of the clamping surfaces of the two workpiece clamping devices has two advantages. On the one hand, the workpiece does not have to be raised significantly during the clamping. Of course, it has to be rotated, but it does not have to be balanced over a solid bearing pivot between desk unit 17 and turntable unit 14. - -

In addition, it is possible to position very large workpieces at the same time on the fixed table unit 17 and the turntable 15 of the rotary tilting table unit 14 which then functions as a fixed table.

The latter is in the illustrated embodiment, however, somewhat counteracted by the preferred construction again. It is provided here that the rotary-swivel unit 14 is pivotally supported relative to the supporting pivot joint 16 in a small support bearing 19. It is provided here that the small support bearing 19 of the rotary-swivel unit 14 is arranged on the rotary-swivel unit 14 facing edge of the fixed table unit 17.

In the illustrated, especially in Fig. 1 well recognizable embodiment, the support bearing 19 projects only a little beyond the clamping surface of the fixed table unit 17 upwards. This support bearing 19 is only an additional bearing, which causes a particularly strong forces on the rotary swivel unit 14 support. It is, as already mentioned, not necessary under all circumstances.

Even with the construction according to the invention, a tool magazine moving along with the traveling column 9 is of particular advantage.

Claims

- Patent claims:

1. Machining center with a machine base support (1) whose horizontal longitudinal orientation defines an X-axis (X-direction) whose horizontal transverse orientation defines a Y-axis (Y-direction) and whose vertical orientation defines a Z-axis (Z-direction) defined, with a on the machine base support (1) mounted protective covering (2) with at least one Beschickungsöffiiung (3) on one longitudinal side, wherein within the protective covering (2) a working space is formed, wherein in the working space near the feed opening (3) in X Direction extending workpiece positioning (7) and from the Beschickungsöffiiung (3) from behind the Werkstückpositionierbereich (7) a parallel to the Werkstückpositionierbereich (7) extending Verfahrfuhrung (8) is provided, one on the Verfahrfuhrung (8) in X. Direction movable traveling column (9) with at least one machining head (10) is provided, wherein in the Werkstückpositionierbereich (7) z at least one workpiece clamping device in the form of a rotary-swivel unit (14) is arranged, which is aligned with its pivot axis in the X direction and wherein by means of the equipped with a tool machining head (10) of the driving stand (9) on a workpiece in the positioning (7) spanned Workpiece processing is vociferous, characterized in that the rotary-swivel unit (14) only on one side a rotary table (15) carrying the pivot joint (16).

2. Machining center according to claim 1, characterized in that in the material positioning region (7) in the Y direction as seen next to the rotary swivel unit (14) a work piece on clamping device in the form of a fixed table unit (17) is arranged.

3. Machining center according to claim 2, characterized in that the fixed table unit (17) on its clamping surface in the X direction extending grooves (18), in which clamping devices for a workpiece are freely displaceable.

4. Machining center according to claim 2 or 3, characterized in that the clamping surface of the turntable (15) of the rotary pivot unit (14) lie in a horizontal position and the clamping surface of the fixed table unit (17) substantially in one plane.

5. Machining center according to one of claims 1 to 4, characterized in that the rotary-swivel unit (14) is pivotally supported relative to the supporting pivot joint (16) in a small support bearing (19).

6. Machining center according to claim 5, characterized in that the small support bearing (19) of the rotary-swivel unit (14) on the rotary swivel table unit (14) facing edge of the fixed table unit (17) is arranged.

7. Machining center according to claim 5 or 6, characterized in that the support bearing (19) in the Z direction not or only slightly beyond the clamping surface of the fixed table unit (17) protrudes.

8. Machining center according to one of claims 1 to 7, characterized in that the traveling column (9) has a moving tool magazine for the machining head (10).